12.Arteries: Vessels made of thick muscles and elastic fibrers that stretch under pressure from blood

13.Arteries: Carry blood away from heart

14.Arteriosclerosis: Hardening of arteries

15.Atria: Top two chambers

16.Bradycardia: Slow heart rate (under 60 bpm resting [non athlete])

17.Capillaries: Carry blood to all cells

18.Capillary: Brings blood to every cell in the body

19.Capillary: One-cell thick vessels that allow oxygen and co2 to diffuse through their walls. Bring blood to every cell in body.

20.Codominant: Dominancy of A/B alleles

21.Coronary Artery Disease: Narrowing of the coronary arteries due to plaque on the vessel walls

22.Coronary Artery Disease, to avoid a heart attack.: The condition that would construe coronary bypass surgery, and why.

23.Coronary Bypass Surgery: Open-heart surgery in which the rib cage is opened and a section of a blood vessel is grafted from the aorta to the coronary artery to bypass the blocked section of the coronary artery and improve the blood supply to the heart

24.Diastolic blood pressure: The blood pressure during relaxation of the ventricles